Reversing-gear for steam or other engines.



PATENTED JULY 7, 1903;

H. LENTZ. RBVERSING GEAR FOR STEAM OR OTHER ENGINES.

APPLICATION FILED 00 110. 1902.

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30 MODEL i I jr zf-enzfar'g fl a Z877? No. 733,058. PATENTED JULY v, 1903.

v H. LENTZ. RBVEBSING GEAR FOR STEAM OR OTHER ENGINES.

APPLICATION FILED 00T.10, 1902.

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Q z I l --J E E 0 'UNITED STATES Patented July 7, recs.

PATENT @FFlCEt HUGO LENTZ, OF LEIPZIG-SCHLEUSSIG, GERMANY.

REVERSINGEGEAR .F o R STEAM OR OTHER memes.

SPECIFICATION forming part of Letters Patent No. 733,058, dated July 7, 1903.

Application filed October 10, 19 02. Serial No. v12 6,'I1 8.(ll'o model.)

To all whom it may concern: 7 Be it known that I, HUGOLENTZ, a subject of the Emperor of Austria-Hungary, and'a resident of Leipzig-Schleussig, Saxony, Ger,- 5 manEmpire, have invented certain new and useful Improvements Relating to Reversing .Gear for Steam or other Engines, of which the following is a specification.

This invention relates to a singlereversingto gear arrangement with one eccentric only, whereof the distinguishing feature is that the eccentric, which is revoluble on a pivot or pin secured to the distributing-shaft laterallyand is provided with segments of an in- !5 ternal (or nut) screw-thread, is turned on its pivot through :the axial displacement of a.

spindle which .is housedwithin the saiddistributing-shaft, made hollow for the purpose,

' and is provided with segments of an outer m-screw-thread corresponding to the inner screw-threading of the eccentric, the move-" I ment thus imparted to the eccentric, being such that in the triangles formed by the lines which connect the center of the eccentric pin 'or pivot, the center of the distributing-shaft, and the center of the eccentric itself the line extending from thecenter of the pivot to the center of the forms the longest side. Fromthe reversing mechanism hitherto known this arrangement, besides being more simple, diifers in this, that it enables the advantages of Stephensons link-motion tobe secured by means of intersecting crossed) links or rods, that the adj usting-spindle engages with the eccentric direct, and that the reactive efie'cts of the distributing device are taken up immediately during this engagement instead of "being transmitted to the adjusting mechain 4o ism, so. that even where this improvement is carried out on a very large scale the said mechanism may conveniently and safely be controlledby hand. I p

In the accompanying drawings, Figure 1 is a cross-section, and Fig. 2 a longitudinal section, of the reversing-gear constructed in ac- 'cordance with this invention, whileFigs. 3, 4, and 5 show the segments of screw-threads of the adjusting-spindle and'eccentric. Fig.

5e 6 "is a diagram of thereversing-gear super-.

, posed to serve for a single slide-valve, and

Fig. 7 represents the slide-valve itself.

distributin g shaft invariably.

said center m of such eccentric,'simil'arly to,

the imaginary eccentric'in a Stephenson linkmotion with intersecting links, may be moved through an are m m m convex in relation to the center w of the distributing-shaft c, or, 4

toexpress it geometrically,-so that in the triangles 0a b m formed at any time by the center m of the eccentric, the center 00 of the distributing-shaft, and the center of the eccen tric-pin b the line connecting the center of the pin 11 and the center In of the distributing-i shaft invariablylconstitutes the longest side of the triangle.

-Within the hollow distributingshaft 0,

which is suitably notched or recessed at the point where the eccentric a is situated, there is inserted the adjusting-spindle e, which-a suitabledevice-such as a guiding-wedge f,

for example -prevents from being turned out of positionwhile it is adjustable in the direction of the axial line of the distributingshaft c. The said adjusting-spindle, 6 forms a segment .of a many-threaded screw (see Figs. 3 and at) the axis of which coincides with. that of .thepin'b'. Fig. 3 presents the screw-thread (heresupposed to extehdallaround, though i in the mechanism it is of courseincom plete).from which the adjusting-spindle e must be assumed to have been cat out. The eccentric carriesa segment of anut or inner screw-thread 9, corresponding to the abovementioned (outer) screw-thread, the axis of which, therefore, likewise coincides with that of the pin 11. Thus it will be seen that by an axial displacement of. the adj usting-spindle e and throughthe agency of the screw-threads the eccentric a will be caused to perform a rotation on its pin 6, and the center m of such eccentric be thereby displaced, the positions m andm' corresponding to a full charge, forward or backward, as the case may be, while the position m corresponds to the zero charge, so that, as will beseen from Fig. 5, this reversion will produce a distribution of steam alike to that which would be caused by a Stephenson link-motion with crossed eccentric-rods, whereof the peculiarity is that as the charge decreases the linear lead also diminishes,v and by'the time eccentricity be- \com es smallest-z. e. ,com es to the zero-point also reaches zero, or the point corresponding to an absolute zero charge.

It will be seen that the several teeth (here termed segments of screw-threads) do not, as in toothed wheels, meet along one line only, but in all cases cover each others entire surface, so that the specific pressure mutually exercised by them becomes-very'small and any wear, so far as these teeth are concerned,

is practically out of the questionjand it will further be seen that the reacting forces brought to bear upon'the valve-spindle by the operation of the reversing device, through 4 the medium of the eccentric, are taken up by the screw-thread segments of the adjustingspindle e and are not, therefore, further transmitted to the parts whereby the said spindle ing-spindleonly.

Having now described my. invention, what I claim as new, and desire to secure byLetters. Patent, is 30 In a reversing-gear for engines, the combination of a tubular shaft having a lateral oif-, set carrying an eccentrically-located supporting-pivot, ashiftable eccentric wheel carried by the oifset portion of the shaft and having 3 5 an eccentric mounting upon the said support' ing-pivot, said eccentrichaving an opening formed along one edge thereof with a series of internal screwthread segments, and a longitudinally or axially adjustable spindle slidably interlocked with the tubular shaft inside of the latter and held by the interlocked connection to a fixed reciprocatory movement, the said spindle being provided thereon with a series of externalscre'w-thread 45 segments slidablebetween and against those of the eccentric-wheel,v substantially as set forth.

In witness whereof I have hereunto set my hand in presence of two witnesses. HUGO LENTZ.

Witnesses:

K. MERK, 'L. LICHTENSTEINER. 

